Sorry for the confusion. SP2 is not yet released. Latest is Dec 2012 CU.

http://technet.microsoft.com/en-US/office/ee748587.aspx

But even for SP patching, we faced some issues with Project server 2007 .

This happened because we missed to stop the SharePoint timer-jobs while patching and there are few guidelines to do patching.

Anyways PSConfigUI will do it for us on CU, Its nice to add a feature for SP/CU patching in AutoSPInstaller, which eventually became a standard for SharePoint installations in most of the organizations.